Steel Overseer

{T}: Put a +1/+1 counter on each artifact creature you control.

Snow-Covered Mountain

As an additional cost to cast this spell, sacrifice an artifact.
Shrapnel Blast deals 5 damage to any target.

Affinity for artifacts (This spell costs {1} less to cast for each artifact you control.)

({B/P} can be paid with either {B} or 2 life.)
Flying
Lifelink (Damage dealt by this creature also causes you to gain that much life.)

Kazuul's Cliffs enters tapped.
{T}: Add {R}.

As an additional cost to cast this spell, sacrifice a creature.
Kazuul's Fury deals damage equal to the sacrificed creature's power to any target.

Equipped creature gets +1/+0 for each artifact you control.
{B}{B}: Attach Cranial Plating to target creature you control.
Equip {1}

Drossforge Bridge enters tapped.
Indestructible
{T}: Add {B} or {R}.

Galvanic Blast deals 2 damage to any target.
Metalcraft — Galvanic Blast deals 4 damage instead if you control three or more artifacts.

At the beginning of the end step, if you control no artifacts, sacrifice Glimmervoid.
{T}: Add one mana of any color.